newsupernova/vendor/magento/module-sales/Controller/AbstractController/Creditmemo.php

<?php
/**
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Sales\Controller\AbstractController;

abstract class Creditmemo extends \Magento\Sales\Controller\AbstractController\View
{
}